package cn.edu.scau.cmi.wuyihan.exercise6.Example6_6;
 	
 	public class A {
 	    final double PI=3.1415926;
 	    public double getArea(final double r) {
 	    	return PI*r*r;
 	    }
 	    public final void speak() {
 	    	System.out.println("How's everthing here?");
 	    }
 	}